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Juan Adánez – One of the best experts on this subject based on the ideXlab platform.

  • Coal combustion via Chemical Looping assisted by Oxygen Uncoupling with a manganese‑iron mixed oxide doped with titanium
    Fuel Processing Technology, 2020
    Co-Authors: Raúl Pérez-vega, Alberto Abad, Francisco García-labiano, Pilar Gayán, Maria Izquierdo, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract Chemical looping combustion allows the carbon dioxide capture by using an oxygen carrier, which transports the oxygen required for combustion from the Air to the fuel. But complete combustion of a solid fuel is not achieved when low cost materials were used as oxygen carriers. Manganese‑iron mixed oxide doped with titanium has been identified as a promising oxygen carrier to improve combustion efficiency due to its oxygen uncoupling capability. The objective of this work was to assess the potential of this oxygen carrier when burning coal in a chemical looping unit. The coal combustion efficiency and carbon dioxide capture were evaluated as a function of the operating conditions both in the fuel and Air Reactor. Carbon dioxide capture was affected by the solids residence time in the fuel Reactor. Coal combustion efficiency increased as the oxygen uncoupling capability was enhanced by using suitable operating conditions in the Air Reactor. Almost full coal combustion (99.4%) was achieved by setting an Air Reactor temperature of 880 °C, an Air excess of 1.8, a fuel Reactor temperature of 925 °C, and an oxygen carrier to fuel ratio >3. The oxygen carrier showed magnetic properties, allowing its re-use after being separated from ash.

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  • Chemical Looping Combustion of biomass: CLOU experiments with a Cu-Mn mixed oxide
    Fuel Processing Technology, 2018
    Co-Authors: I. Adánez-rubio, Alberto Abad, Francisco García-labiano, Pilar Gayán, T. Mendiara, Maria Izquierdo, Antón Pérez-astray, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract Chemical looping combustion (CLC) is a low-cost CO 2 capture technology with a low energy penalty. Bio-energy with CO 2 capture and storage (BECCS) opens up the possibility for negative CO 2 emissions involving the removal of CO 2 already emitted into the atmosphere. The oxygen needed for combustion in CLC processes is supplied by a solid oxygen carrier circulating between the fuel Reactor and the Air Reactor. In this work, the combustion of different types of biomass, such as pine sawdust, olive stones and almond shells, was studied in a continuous 1.5 kW th CLC unit. A mixed Cu-Mn oxide was used as the oxygen carrier. This material releases gaseous oxygen when reduced, resulting in Chemical looping combustion with oxygen uncoupling (CLOU). The released oxygen reacts with both the volatiles and char generated inside the fuel Reactor when biomass is fed into it. The oxygen carrier is reoxidized in Air inside the Air Reactor. High CO 2 capture and 100% combustion efficiencies were achieved with this Cu-Mn oxygen carrier. The oxygen concentration inside the Air Reactor did not affect CO 2 capture efficiency under the studied conditions.

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  • Coal combustion with a spray granulated Cu-Mn mixed oxide for the Chemical Looping with Oxygen Uncoupling (CLOU) process
    Applied Energy, 2017
    Co-Authors: Iñaki Adánez-rubio, Alberto Abad, Francisco García-labiano, Pilar Gayán, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract The Chemical Looping with Oxygen Uncoupling (CLOU) process is a form of Chemical Looping Combustion (CLC) technology that enables the combustion of solid fuels by means of oxygen carriers that release gaseous oxygen in the fuel Reactor, i.e. with oxygen uncoupling capability. In recent years, tests have found several Cu-based, Mn-based and mixed oxide oxygen carriers with suitable properties for the CLOU process. Among them, Cu-Mn mixed oxides show high reactivity and high O2 equilibrium concentration at temperatures of interest for coal combustion. In this work, proof of concept was demonstrated by burning coal with Cu-Mn mixed oxides in a 1.5 kWth CLOU unit for the first time. The effect of fuel Reactor temperature, solids circulation flow, fluidization agent in the fuel Reactor (inert N2 or steam as gasifying agent), and excess Air in the Air Reactor on combustion efficiency and CO2 capture rate was analysed. The results showed that high combustion efficiency and CO2 capture are feasible using this material at relatively low fuel Reactor operating temperatures. Therefore, the developed Cu-Mn mixed oxide was a suitable material for use as an oxygen carrier for the CLOU combustion of solid fuels. Optimum operating conditions were determined for this oxygen carrier with regard to the oxygen circulation rate and Air Reactor conditions for the regeneration of the oxygen carrier.

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Alberto Abad – One of the best experts on this subject based on the ideXlab platform.

  • Coal combustion via Chemical Looping assisted by Oxygen Uncoupling with a manganese‑iron mixed oxide doped with titanium
    Fuel Processing Technology, 2020
    Co-Authors: Raúl Pérez-vega, Alberto Abad, Francisco García-labiano, Pilar Gayán, Maria Izquierdo, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract Chemical looping combustion allows the carbon dioxide capture by using an oxygen carrier, which transports the oxygen required for combustion from the Air to the fuel. But complete combustion of a solid fuel is not achieved when low cost materials were used as oxygen carriers. Manganese‑iron mixed oxide doped with titanium has been identified as a promising oxygen carrier to improve combustion efficiency due to its oxygen uncoupling capability. The objective of this work was to assess the potential of this oxygen carrier when burning coal in a chemical looping unit. The coal combustion efficiency and carbon dioxide capture were evaluated as a function of the operating conditions both in the fuel and Air Reactor. Carbon dioxide capture was affected by the solids residence time in the fuel Reactor. Coal combustion efficiency increased as the oxygen uncoupling capability was enhanced by using suitable operating conditions in the Air Reactor. Almost full coal combustion (99.4%) was achieved by setting an Air Reactor temperature of 880 °C, an Air excess of 1.8, a fuel Reactor temperature of 925 °C, and an oxygen carrier to fuel ratio >3. The oxygen carrier showed magnetic properties, allowing its re-use after being separated from ash.

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  • Life cycle assessment of natural gas fuelled power plants based on chemical looping combustion technology
    Energy Conversion and Management, 2019
    Co-Authors: Alberto Navajas, Alberto Abad, Francisco García-labiano, T. Mendiara, Víctor Goñi, Adrián Jiménez, Luis M. Gandía, Luis F. De Diego

    Abstract:

    Abstract Among the different Carbon Capture and Storage (CCS) technologies being developed in the last decades, Chemical Looping Combustion (CLC) stands out since it allows inherent CO2 capture. In the CLC process, there is a solid oxygen carrier circulating between two Reactors in a cycle that allows providing the oxygen needed for combustion. In one of the Reactors, named as fuel Reactor, the fuel is introduced and combusted while the oxygen carrier reduction takes place. In the second Reactor, named Air Reactor, the oxygen carrier is reoxidized in Air. Different materials based on copper, nickel and iron oxides have been proposed as oxygen carriers for the CLC process. This work presents an environmental evaluation of the CLC process for natural gas based on Life Cycle Assessment (LCA). Five different oxygen carrier materials already tested in pilot plants were considered and the results compared to the conventional natural gas combustion in a gas turbine in a combined cycle without and with CO2 capture using postcombustion capture with amines. In view of the results, lower impact of the CLC process compared to the base case is expected without and with CO2 capture. The influence of several variables on the results was considered, such as temperature in the Air Reactor, lifetime of the oxygen carrier and possibility of recuperation of the depleted oxygen carrier. The nickel-based oxygen carriers were identified as the most adequate to be used in natural gas combustion. However, due to their toxicity, several analyses were also performed in order to identify improvements in the known oxygen carriers that can qualify them to replace nickel-based materials.

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  • Chemical Looping Combustion of biomass: CLOU experiments with a Cu-Mn mixed oxide
    Fuel Processing Technology, 2018
    Co-Authors: I. Adánez-rubio, Alberto Abad, Francisco García-labiano, Pilar Gayán, T. Mendiara, Maria Izquierdo, Antón Pérez-astray, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract Chemical looping combustion (CLC) is a low-cost CO 2 capture technology with a low energy penalty. Bio-energy with CO 2 capture and storage (BECCS) opens up the possibility for negative CO 2 emissions involving the removal of CO 2 already emitted into the atmosphere. The oxygen needed for combustion in CLC processes is supplied by a solid oxygen carrier circulating between the fuel Reactor and the Air Reactor. In this work, the combustion of different types of biomass, such as pine sawdust, olive stones and almond shells, was studied in a continuous 1.5 kW th CLC unit. A mixed Cu-Mn oxide was used as the oxygen carrier. This material releases gaseous oxygen when reduced, resulting in Chemical looping combustion with oxygen uncoupling (CLOU). The released oxygen reacts with both the volatiles and char generated inside the fuel Reactor when biomass is fed into it. The oxygen carrier is reoxidized in Air inside the Air Reactor. High CO 2 capture and 100% combustion efficiencies were achieved with this Cu-Mn oxygen carrier. The oxygen concentration inside the Air Reactor did not affect CO 2 capture efficiency under the studied conditions.

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Pilar Gayán – One of the best experts on this subject based on the ideXlab platform.

  • Coal combustion via Chemical Looping assisted by Oxygen Uncoupling with a manganese‑iron mixed oxide doped with titanium
    Fuel Processing Technology, 2020
    Co-Authors: Raúl Pérez-vega, Alberto Abad, Francisco García-labiano, Pilar Gayán, Maria Izquierdo, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract Chemical looping combustion allows the carbon dioxide capture by using an oxygen carrier, which transports the oxygen required for combustion from the Air to the fuel. But complete combustion of a solid fuel is not achieved when low cost materials were used as oxygen carriers. Manganese‑iron mixed oxide doped with titanium has been identified as a promising oxygen carrier to improve combustion efficiency due to its oxygen uncoupling capability. The objective of this work was to assess the potential of this oxygen carrier when burning coal in a chemical looping unit. The coal combustion efficiency and carbon dioxide capture were evaluated as a function of the operating conditions both in the fuel and Air Reactor. Carbon dioxide capture was affected by the solids residence time in the fuel Reactor. Coal combustion efficiency increased as the oxygen uncoupling capability was enhanced by using suitable operating conditions in the Air Reactor. Almost full coal combustion (99.4%) was achieved by setting an Air Reactor temperature of 880 °C, an Air excess of 1.8, a fuel Reactor temperature of 925 °C, and an oxygen carrier to fuel ratio >3. The oxygen carrier showed magnetic properties, allowing its re-use after being separated from ash.

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  • Chemical Looping Combustion of biomass: CLOU experiments with a Cu-Mn mixed oxide
    Fuel Processing Technology, 2018
    Co-Authors: I. Adánez-rubio, Alberto Abad, Francisco García-labiano, Pilar Gayán, T. Mendiara, Maria Izquierdo, Antón Pérez-astray, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract Chemical looping combustion (CLC) is a low-cost CO 2 capture technology with a low energy penalty. Bio-energy with CO 2 capture and storage (BECCS) opens up the possibility for negative CO 2 emissions involving the removal of CO 2 already emitted into the atmosphere. The oxygen needed for combustion in CLC processes is supplied by a solid oxygen carrier circulating between the fuel Reactor and the Air Reactor. In this work, the combustion of different types of biomass, such as pine sawdust, olive stones and almond shells, was studied in a continuous 1.5 kW th CLC unit. A mixed Cu-Mn oxide was used as the oxygen carrier. This material releases gaseous oxygen when reduced, resulting in Chemical looping combustion with oxygen uncoupling (CLOU). The released oxygen reacts with both the volatiles and char generated inside the fuel Reactor when biomass is fed into it. The oxygen carrier is reoxidized in Air inside the Air Reactor. High CO 2 capture and 100% combustion efficiencies were achieved with this Cu-Mn oxygen carrier. The oxygen concentration inside the Air Reactor did not affect CO 2 capture efficiency under the studied conditions.

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  • Coal combustion with a spray granulated Cu-Mn mixed oxide for the Chemical Looping with Oxygen Uncoupling (CLOU) process
    Applied Energy, 2017
    Co-Authors: Iñaki Adánez-rubio, Alberto Abad, Francisco García-labiano, Pilar Gayán, Luis F. De Diego, Juan Adánez

    Abstract:

    Abstract The Chemical Looping with Oxygen Uncoupling (CLOU) process is a form of Chemical Looping Combustion (CLC) technology that enables the combustion of solid fuels by means of oxygen carriers that release gaseous oxygen in the fuel Reactor, i.e. with oxygen uncoupling capability. In recent years, tests have found several Cu-based, Mn-based and mixed oxide oxygen carriers with suitable properties for the CLOU process. Among them, Cu-Mn mixed oxides show high reactivity and high O2 equilibrium concentration at temperatures of interest for coal combustion. In this work, proof of concept was demonstrated by burning coal with Cu-Mn mixed oxides in a 1.5 kWth CLOU unit for the first time. The effect of fuel Reactor temperature, solids circulation flow, fluidization agent in the fuel Reactor (inert N2 or steam as gasifying agent), and excess Air in the Air Reactor on combustion efficiency and CO2 capture rate was analysed. The results showed that high combustion efficiency and CO2 capture are feasible using this material at relatively low fuel Reactor operating temperatures. Therefore, the developed Cu-Mn mixed oxide was a suitable material for use as an oxygen carrier for the CLOU combustion of solid fuels. Optimum operating conditions were determined for this oxygen carrier with regard to the oxygen circulation rate and Air Reactor conditions for the regeneration of the oxygen carrier.

    Free Register to Access Article